Lectures on acne, acne rosacea, lichen and prurigo / by Tom Robinson, Physician to St. John's Hospital for Skin Diseases.

  • Robinson, Tom
Date:
1884
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Licence: Public Domain Mark

Credit: Lectures on acne, acne rosacea, lichen and prurigo / by Tom Robinson, Physician to St. John's Hospital for Skin Diseases. Source: Wellcome Collection.

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    observer strip a case of lichen, and be will in a good light find the lichen spots to occupy the position of a hair, hut he will find these spots do not occur in the ordinary acne situa- tions. Let me he clear on this point. Lichen is usually found on the limbs, outer aspects, sometimes on the chest and hack, or, in other words, it is found where the jiuhescent hairs grow abortively; l)ut in such situations as the axillte, the pubis, or the whisker regions, where the hairs grow luxuriantly, we never find lichen, whilst acne is found on the nose, cheeks, forehead, and cliiii, or, in other words, it is found where liairs do not grow. T must say here that I look upon the fol- lowino- definition of lichen as the onlv one which Ave can use. It is a papule AA'hich is aLways umhilicated, Avhich has neA'er an in- flamed base, and Avhich is ahvays a lichen spot; it never becomes vesicular or suppurates. llaviiAg cleared the ground as Avell as I am able of this difficulty, let us ask ourselves Avhat it is Avhich stops the mouth of a sebaceous follicle. In the greater number of cases the over-seci-etion of the gland is onlv an ex])ression of general disorder of the Avhole